[ONOS-3253/3144] Insert support for Netconf device configuration, set and get controllers commands

Change-Id: I99188aa18207b9d0b0d935b9f9e61e547f4ddab1
diff --git a/netconf/api/src/main/java/org/onosproject/netconf/NetconfController.java b/netconf/api/src/main/java/org/onosproject/netconf/NetconfController.java
new file mode 100644
index 0000000..6411c01
--- /dev/null
+++ b/netconf/api/src/main/java/org/onosproject/netconf/NetconfController.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2015 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.netconf;
+
+import org.onlab.packet.IpAddress;
+import org.onosproject.net.DeviceId;
+
+import java.util.Map;
+
+/**
+ * Abstraction of an NETCONF controller. Serves as a one stop shop for obtaining
+ * NetconfDevice and (un)register listeners on NETCONF device events.
+ */
+public interface NetconfController {
+
+    /**
+     * Adds Device Event Listener.
+     *
+     * @param listener node listener
+     */
+    void addDeviceListener(NetconfDeviceListener listener);
+
+    /**
+     * Removes Device Listener.
+     *
+     * @param listener node listener
+     */
+    void removeDeviceListener(NetconfDeviceListener listener);
+
+    /**
+     * Tries to connect to a specific NETCONF device, if the connection is succesful
+     * it creates and adds the device to the ONOS core as a NetconfDevice.
+     *
+     * @param deviceInfo info about the device to add
+     * @return NetconfDevice Netconf device
+     */
+    NetconfDevice connectDevice(NetconfDeviceInfo deviceInfo);
+
+    /**
+     * Removes a Netconf device.
+     *
+     * @param deviceInfo info about the device to remove
+     */
+    void removeDevice(NetconfDeviceInfo deviceInfo);
+
+    /**
+     * Gets all the nodes information.
+     *
+     * @return map of devices
+     */
+    Map<DeviceId, NetconfDevice> getDevicesMap();
+
+    /**
+     * Gets a Netconf Device by node identifier.
+     *
+     * @param deviceInfo node identifier
+     * @return NetconfDevice Netconf device
+     */
+    NetconfDevice getNetconfDevice(DeviceId deviceInfo);
+
+    /**
+     * Gets a Netconf Device by node identifier.
+     *
+     * @param ip   device ip
+     * @param port device port
+     * @return NetconfDevice Netconf device
+     */
+    NetconfDevice getNetconfDevice(IpAddress ip, int port);
+
+}